## PRACTICE PROBLEM SET 13 Now try these problems

MATHEMATICS · Subjective · CBSE · Mathematics · Applications of Derivatives · Applications of Derivatives

Problem

## PRACTICE PROBLEM SET 13 Now try these problems. The answers are in Chapter 23, starting on page 508. 3. If the position function of a particle is

x(t)=\sin \left(\frac{t}{2}\right), 0<t<4 \pi

, find when the particle is changing direction.